Quote:
Originally Posted by stownsen914
sugarwood - do you have some evidence that ZDDP isn't actually needed for older, flat tappet type engines?
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Used oil analysis. Test your lower ZDDP oil on your flat tappets. If it wasn't working, it would show up as increased wear metals.
I am not against ZDDP in any way, especially for older cars driven rarely, but people ascribe it these magical properties while ignoring other important aspects of oil. It's a moot point anyway, because I doubt there is an oil that meets the 15W-50 viscosity requirements for the old 911 that is actually low ZDDP.
https://www.amsoil.com/newsstand/classic-and-vintage/articles/reduced-zddp-and-wear-protection/